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Although it has been recognized that employees regularly engage in non-green behaviors, little research has been conducted to explain how these behaviors may be avoided. Using data from a three-wave study, this study tested a moderated-mediation model in which trust in the immediate manager was expected to increase the indirect effect of supervisory support for the environment on non-green behaviors through employee environmental commitment. While the findings showed, as predicted, that exchange relationships with the immediate manager reduce the tendency of employees to engage in non-green behaviors, the indirect effect of supervisory support on non-green behaviors through employee environmental commitment was moderated at a low level of trust in the manager, contrary to predictions. Though unexpected, this result seems less surprising when discussed in the light of negotiated exchange, suggesting that employee efforts to avoid non-green behaviors need to be seen as the result of a deal between managers and subordinates. The findings of this study contribute to the emerging literature on social exchange in an environmental context and have implications for organizations seeking to achieve environmental sustainability.